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Effect of Catalyst

The differenc...

Question

The difference between threshold energy and average energy of reactant molecules is called:

A

dissociation energy

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B

activation energy

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C

binding energy

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D

chemical bonding energy

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Solution

The correct option is D activation energy
It is the minimum energy required to start a chemical reaction. It is the energy barrier separating the two minima of potential energy of reactants and products of a reaction.

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Q. Assertion :Bond energy and bond dissociation energy have identical value for diatomic molecules Reason: Greater the bond dissociation energy, less reactive is the bond.

Q. Bond energies can be obtained by using the following relation:

Δ H (r e a c t i o n) = \sum

Bond energy of bonds, broken in the reactants

- \sum

Bond energy of bonds, formed in the products
Bond energy depends on three factors:
a. greater is the bond length, lesser is the bond energy
b. bond energy increases with the bond multiplicity
c. bond energy increases with the electronegativity difference between the bonding atoms.Bond energy of different halogen molecules will lie in the sequences of:

Q. The dissociation energy of methane is

360 k c a l m o l^{- 1}

. The average bond energy of

C - - H

k c a l m o l^{- 1}

Q. Potential energy difference between the reactant and activated complex is called. The minimum amount of energy needed for the particles to react is

Q. Bond energies can be obtained by using the following relation:

Δ H (r e a c t i o n) = \sum

Bond energy of bonds, broken in the reactants

- \sum

Bond energy of bonds, formed in the products
Bond energy depends on three factors:
a. greater is the bond length, lesser is the bond energy
b. bond energy increases with the bond multiplicity
c. bond energy increases with the electronegativity difference between the bonding atoms.The heat of formation of

N O

from its elements is

+ 90 k J m o l^{- 1}

, What is the approximate bond dissociation energy of the bond in

N O

?

B E_{N \equiv N} = 941 k J m o l^{- 1}

B E_{O = O} = 499 k J m o l^{- 1}

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